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18
Area = 18*18 = 324 square meters
Say one of the sides is s. Because it is a square, both the length and width (both sides) are s. Area = length x width So 324 = s x s, or 324 = s2. So s is equal to the square root of 324. Because perimeter is the sum of the sides, add s + s + s + s.
It depends what the 324 inches refers to. It cannot be the area since an area is measured in square inches, not inches. The question is unnecessary if the 324 inches refers to the length of the sides. If 324 inches is the perimeter, then the length of one side is 324/4 = 81 inches.
The area is 324 square inches.